In 1952 he entered a voice competition, which was coordinated with the opening of the Mario Lanza film The Great Caruso. After winning the Irish section of this competition,[1] he attended the finals in England where he was runner-up. This brought a good deal of interest in his voice. He began with the noted Italian tenor Dino Borgioli and had a number of singing engagements in England.

He had a breakthrough in 1958 when he was invited to sing leading tenor roles at the Mannheim State Opera. Another opportunity opened up for him in 1960 when he was invited to sing at the prestigious Hamburg State Opera.

In June 1961 he suffered a heart attack. He was known to be a very heavy smoker. He returned to Dublin for his recovery and in April 1962 he was able to return to Hamburg where in September 1962 he suffered a fatal heart attack.[2]

Troy did not leave many recordings. He is a member of a prestigious cast on an EMI recording of Richard Strauss' Capriccio and in the 1957 recording of a live performance of Les Troyens by Berlioz. He also recorded Mozart's Zaide. Of Irish music, he recorded selections of Thomas Moore's Irish Melodies and a small number of songs by John F. Larchet and Aloys Fleischmann.